Title: Variable displacement hydraulic pump apparatus

Abstract: A hydraulic pump apparatus including an outer housing having internal walls which are spherically configured, a hydraulically actuable variable position control ring which cooperates with the spherical housing walls to define the geometry of a hydraulic working cavity, and a rotor assembly having vanes which divide the working cavity into a plurality of working chambers and which follow the position of the control ring to vary the volume of the working chambers so as to move fluid into and out of inlet and outlet ports, respectively. The vanes are supported by a plurality of concentric rings which are attached in gimbal fashion to a rotor hub and pin assembly.

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Inventors: Drake, J. Howard (Santa Clara, CA, US)

Application Number: 684638
Filing Date: 1976-05-10
Publication_date: 1977-03-15
Assignee:
Primary Class(es): 60/465 60/487, 60/490, 417/359
Other Classes:
US Patent Ref:

1571954	Feb, 1926	Lambert	60/490.
2420806	May, 1947	Anderson	60/487.
2685255	Aug, 1954	Carner	60/490.
3044409	Jul, 1962	Harris	60/487.

Other Refs:
Primary Examiner: Geoghegan, Edgar W.
Assistant Examiner:
Attorney: Boone, Schatzel, Hamrick & Knudsen